The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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很多有灵气的作者，就困在这第一步。我身边有一位优秀的青年写作者，名校、专业好，读书多、很有想法，我常常被他新颖的见解所吸引。他很爱说的一句话是：等我写出来，肯定会有很多人与您一样的感受。我不断鼓励他，却总是听到他回复：开了头，但总是不完美。总想一步到位，结果呢？笔尖生了锈，灵感发了霉。
The Future of Agar